Any source? Has this been said by SC staff somewhere? Also, why the player has no Halloween obstacles if he's not banned and his village same as it was 3-4 months ago?

Halloween obstacles have nothing to do with banning — you’re assuming a connection that doesn’t exist.

Supercell does push inactive villages back in the search queue which can mean they never get raided. This is something SC confirmed years ago. If you think about it, there must be a hundred million inactive accounts, and if they were all available for raiding, the game would be so easy it would have no point.

Halloween obstacles have nothing to do with banning — you’re assuming a connection that doesn’t exist.

Supercell does push inactive villages back in the search queue which can mean they never get raided. This is something SC confirmed years ago. If you think about it, there must be a hundred million inactive accounts, and if they were all available for raiding, the game would be so easy it would have no point.

As far as the obstacles go, perhaps only active villages receive them. Or he may be past the obstacle limit. (Too many trees, bushes etc..)

one of my th 11 accounts was permenently banned because of owner varification.(i sold the account and last some problems occured).so after too many complaints of owner varification supercell permenently blocked that account.i cant visit the base using player tag.profile page will not appear bt we can visit the base.
for obstacles,it will not spawn anymore.and the permanantly banned account will not be available in matchmaking too.in maintanance break most of the dead bases will push upto the que.bt perma banned accounts will not appear in mm after maintance break too..

We can still see the obstacles if the player has not logged in or even if the base is destroyed.

Certainly, you can see the obstacles he had when he last logged in and the normal ones. But you wont see the new special ones, since they appear only once he logs back in. If they appear at all. Several low lvl players in my clan that quit ages ago only have normal obstacles in base.